Sideframe pedestal
Freight truck castings on freight trucks have an interface between the freight car truck sideframe and a bearing assembly or bearing adapter. The present invention includes a sideframe with a pedestal jaw, placing a bearing assembly inside the pedestal jaw, and forming a pedestal roof in the pedestal jaw in a shape to evenly distribute a load between the pedestal roof and the bearing assembly. The present invention also provides for reducing load concentration on an interface between a pedestal roof and an axle. The present invention provides a sideframe with two pedestal roofs disposed at opposite ends of the sideframe, an axle placed under the pedestal roof, and an angled interface. The angled interface is formed between the pedestal roof and bearing adapter to reduce load concentration.
1 . A method of compensating for the deflection in an axle in a freight car truck comprising the steps of:
providing a sideframe with a pedestal roof;
placing a bearing assembly under the pedestal roof; and
forming the pedestal roof in a shape to equally distribute load axially across the bearing assembly.
2 . The method of claim 1 further comprising the step of placing the bearing assembly in a bearing adapter before placing the bearing assembly under the pedestal roof.
3 . The method of claim 1 wherein the shape in the pedestal roof is an angle to conform to a bearing adapter, the bearing adapter in substantially even contact with the pedestal roof when the freight car truck is under load.
4 . The method of claim 3 wherein the deflection has a deflection angle in the range of 0 degrees to 5 degrees.
5 . A method of reducing a load concentration on an interface between a sideframe and an axle in a freight car truck comprising the steps of:
providing a sideframe with two pedestal roofs disposed at opposite ends of the sideframe;
placing an axle inside the pedestal roof;
providing a bearing assembly and bearing adapter connected to an end of the axle,
forming an angled interface between the pedestal roof and the bearing adapter, wherein
the bearing adapter contacts the pedestal roof and transfers a freight car load substantially
evenly to the bearing assembly.
6 . The method of claim 5 wherein the bearing adapter is shaped at an acute angle to the pedestal roof.
7 . The method of claim 6 wherein the angle of the bearing adapter to the pedestal roof is between 0 and 5 degrees.
8 . The method of claim 6 wherein the bearing adapter contacts the pedestal roof substantially evenly and transfers the freight car load substantially evenly from the pedestal roof to the bearing assembly.
9 . A freight car truck comprising:
a sideframe with a pedestal jaw;
a bearing assembly within the pedestal jaw;
a pedestal roof formed in the pedestal jaw with an angled shape to substantially evenly distribute a freight car load between the pedestal roof and the bearing assembly.
10 . The freight car truck of claim 9 wherein the bearing assembly has a bearing adapter, the bearing adapter contacting the pedestal roof.
11 . The freight car truck of claim 9 wherein the shape is an acute angle with an edge to conform to an outside edge of the bearing adapter under a no load condition.
12 . The freight car truck of claim 9 wherein the shape is an axial angle in the range of 0 to 5 degrees.
13 . The freight car truck of claim 9 wherein the deflection is an angled arc with a center of the arc being parallel to the sideframe.
14 . The freight car truck of claim 10 wherein the angled shape in the pedestal roof is in substantially even contact with the bearing adapter when the freight car is under load.
15 . A freight car truck comprising:
a sideframe with two pedestal roofs disposed at opposite ends of the sideframe;
an axle placed under the pedestal roof; and
a bearing assembly and bearing adapter connected to an end of the axle forming an angled interface between the pedestal roof and the bearing roof and transfers a freight car load substantially evenly to the bearing assembly.
16 . The freight car truck of claim 15 wherein the bearing adapter is shaped at an acute angle to the pedestal roof.
17 . The freight car truck of claim 16 wherein the angle of the bearing adapter to the pedestal roof is between 0 and 5 degrees.
18 . The freight car truck of claim 15 wherein the bearing adapter contacts the pedestal roof substantially evenly and transforms the freight car load substantially evenly from the pedestal roof to the bearing assembly.
19 . The device of claim 15 wherein the angled interface is an arc with a center of the arc being parallel to a sideframe.